Nancy-
Sounds like the name change would make sense since it would more accurately reflect what your group is doing. Can't think of any cons - the important thing is to promote the good work your group is doing and keep all the families in the loop.
Our PTSO is planning to re-organize for a number of reasons. We serve Pre-k to 5 grade. The question came up if we should consider changing the name to a PTO and drop the 'student'. We do not have student involvement in meetings and our student volunteers are from the high school and not the grades that we serve. I welcome input on pros & cons of this change. I am new to PTSO and want to ensure we make informed decisions moving forward. Thanks.